Ice cream mixer



FIG. 1 is a top, front and right side perspective view of an ice cream mixer showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view thereof, the side opposite being a mirror image; and

FIG. 5 is a rear elevational view thereof. 

The ornamental design for an ice cream mixer, as shown and described. 